US2025026732A1PendingUtilityA1

An improved process for the preparation of crystalline form-a of cyantraniliprole

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Assignee: NATCO PHARMA LTDPriority: Nov 24, 2021Filed: Nov 22, 2022Published: Jan 23, 2025
Est. expiryNov 24, 2041(~15.4 yrs left)· nominal 20-yr term from priority
Inventors:Amarnath JampaniVeeraiah ArudraRadha Rani SamathamJanaki Rama Rao RaviDurga Prasad KonakanchiPulla Reddy MuddasaniVenkaiah Chowdary Nannapaneni
C07D 401/04
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Claims

Abstract

The present invention relates to an improved process for the preparation of Crystalline Form-A of Cyantraniliprole of Formula-I.

Claims

exact text as granted — not AI-modified
We claim: 
     
         1 . An improved process for the preparation of Crystalline Form-A of Cyantraniliprole of Formula-I, comprising the steps of: 
       
         
           
           
               
               
           
         
         a) suspending crystalline Form-B of Cyantraniliprole in a suitable solvent; 
         b) heating the reaction mixture to a suitable temperature ranges from 70° C. to 120° C.; 
         c) cooling the reaction mixture to room temperature; 
         d) isolating Crystalline Form-A of Cyantraniliprole of Formula-I. 
       
     
     
         2 . The process as claimed in  claim 1 , wherein the suitable solvent used in step-(a) is selected from methyl cyclohexane and xylene or mixture thereof. 
     
     
         3 . The process as claimed in  claim 1 , wherein the step-(b) is carried out by azeotropic distillation. 
     
     
         4 . The process as claimed in  claim 1 , wherein isolating Crystalline Form-A of Cyantraniliprole of Formula-I is carried out by conventional techniques such as filtration and dried the product.

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